His wife, U.S Secretary of State Hillary Clinton, and daughter Chelsea are currently by his side.

Dr. Allan Schwartz said that after Bill, 63, had experienced repeated episodes of chest discomfort, it was decided to admit him to the hospital for testing.”President Clinton responded appropriately and promptly to warning symptoms,” the physician reported.

Doctors determined that one of the four bypass grafts done during a 2004 quadruple bypass surgery was now blocked, and thus decided to insert the two stents (tubes) to open and clear his artery. The procedure took about an hour, the doctor reported.

Bill’s doctor said that the procedure today was not done as a result of his lifestyle or diet or cholesterol levels.

He explained that bypass grafts have a 10 to 20 percent failure rate after five to six years. However, the doctor said that the most important bypass graft is holding strong and he expects that it will continue to hold strong.

The doctor also noted that the 42nd president is up and walking around and visiting family, and that the hospital hopes to release him today.